limit size for poolz/vz subvol to prevent snapshots from taking up all disk space

[rcd]

My Proxmox install is on ZFS, and I have a couple of zvols:

Unfortunately I didn't realize at the time that it would be a good idea to limit the space for /var/lib/vz so snapshots don't accidentally take up all the diskspace.

This now happened, and after having cleaned up, I was wonder if it is possible to reduce/limit the size of my poolz/vz zvol?

Or do I need to delete it and create a new?

# zfs list
NAME                          USED  AVAIL     REFER  MOUNTPOINT
poolz                        2.38T  1.10T      177G  /poolz
poolz/vmdata                  805G  1.10T      128K  /poolz/vmdata
poolz/vmdata/vm-2529-disk-0  74.6K  1.10T     74.6K  -
poolz/vmdata/vm-3701-disk-0  36.3G  1.10T     36.3G  -
poolz/vmdata/vm-3701-disk-1   277G  1.10T      277G  -
poolz/vmdata/vm-3702-disk-0  8.49G  1.10T     8.49G  -
poolz/vmdata/vm-3703-disk-0  9.49G  1.10T     9.49G  -
poolz/vmdata/vm-3704-disk-0  83.5G  1.10T     83.5G  -
poolz/vmdata/vm-3705-disk-0   187G  1.10T      187G  -
poolz/vmdata/vm-3705-disk-1   202G  1.10T      202G  -
poolz/vmdata/vm-3706-disk-0  6.89M  1.10T     6.89M  -
poolz/vmdata/vm-3706-disk-1  6.99M  1.10T     6.99M  -
poolz/vz                     1.42T  1.10T     1.42T  /var/lib/vz

 

[harry700]

How about zfs set quota=SIZE poolz/vz?
https://docs.oracle.com/cd/E23823_01/html/819-5461/gazvb.html

 

[rcd]

Awesome! Perfect!

 

[LnxBil]

It is also great to use refreservation for very important datasets like rpool/ROOT/pve-1 so that they cannot run out of space while the pool is already full.

 

[rcd]

It is also great to use refreservation for very important datasets like rpool/ROOT/pve-1 so that they cannot run out of space while the pool is already full.

Thanks, good idea. Setting Reservations on ZFS File Systems